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Current scenario when PipeWire desktop capturer is used:
Chromium picker dialog is created with screen and window capturer. Each
capturer makes an xdg-desktop-portal call, showing another picker
dialog. Once user confirms both pickers on xdg-desktop-portal side, yet
another picker is shown as a new capturer is created for the web page
itself.

With this change:
Chromium picker dialog is created, but only screen capturer will be
created as with xdg-desktop-portal the picker will handle both screens
and windows. Also in the chromium picker, the "window" tab creating
window capturer expects a list of windows and doesn't show previews,
but we need actually to behave exactly like the "screen" tab and show
preview of selected window. Then again, yet another picker from
xdg-desktop-portal is shown as a new capturer is created for the web
page itself.

Bug: chromium:1157006
Change-Id: I39eafc72eb46da7868d1114b5c106030c22787a4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2578840
Commit-Queue: mark a. foltz <mfoltz@chromium.org>
Reviewed-by: mark a. foltz <mfoltz@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836814}